R4 server pieces: typed admin statistics, DELETE media, accounts by ids, hashtag history in search

Completion program R4 (the client catching up), the server's part.

- /clientapi/admin/statistics/hosts/{host}, /events and /server answer typed views (ViewHostDetail, ViewHostInstance,
  ViewHostDay, ViewInteractionEvent, ViewServerDay in ClientModels) instead of an anonymous object and raw entities:
  the instance's public description, never its raw instance API document; the events without their actor hash. The
  JSON names stay, so lib/interop.sh's stats_check reads them as before.
- DELETE /api/v1/media/{id} (Mastodon 4.4): a persona's own upload goes to the trash while nothing holds it; a posted
  or scheduled one answers 422.
- GET /api/v1/accounts?id[]= (Mastodon 4.3): up to 40 accounts, those that exist.
- /api/v2/search's hashtags carry their week of use (TagsController.History), not an empty history.

Verified: dotnet build PrivaPub.sln -c Release; the pasture: gts 64/64 (statistics included); by hand, an unattached
upload deleted (then 404), a posted one refused (422), accounts by ids, a hashtag's history.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WpVCoDeM1qUTRp4fXQdfof

PrivaPub.ClientModels/Admin/ViewStatistics.cs

@@ -96,4 +96,96 @@ namespace PrivaPub.ClientModels.Admin
 		public string CrawlError { get; set; }
 		public string Software { get; set; }
 	}
+
+	// /clientapi/admin/statistics/hosts/{host}: one server, what it says of itself, its days and its latest events
+	public class ViewHostDetail
+	{
+		public string Host { get; set; }
+		public ViewHostInstance Instance { get; set; }
+		public List<ViewHostDay> Days { get; set; } = [];
+		public List<ViewInteractionEvent> Events { get; set; } = [];
+		public string Attribution { get; set; }
+	}
+
+	public class ViewHostInstance
+	{
+		public string Software { get; set; }
+		public string SoftwareVersion { get; set; }
+		public string NodeName { get; set; }
+		public string Title { get; set; }
+		public string NodeDescription { get; set; }
+		public bool? OpenRegistrations { get; set; }
+		public string RegistrationMode { get; set; }
+		public long? UsersTotal { get; set; }
+		public long? UsersActiveMonth { get; set; }
+		public long? LocalPosts { get; set; }
+		public List<string> Languages { get; set; } = [];
+		public string Seen { get; set; }
+		public DateTime? FirstSeenAt { get; set; }
+		public DateTime? LastSeenAt { get; set; }
+		public DateTime? DescribedAt { get; set; }
+		public string DescriptionError { get; set; }
+		public DateTime? LastSuccessAt { get; set; }
+		public DateTime? LastFailureAt { get; set; }
+		public string LastError { get; set; }
+		public int ConsecutiveFailures { get; set; }
+		public DateTime? UnavailableUntil { get; set; }
+		public string Country { get; set; }
+		public string City { get; set; }
+		public int? Asn { get; set; }
+		public string AsnOrg { get; set; }
+		public string Cdn { get; set; }
+		public string InstanceApi { get; set; }
+		public string SourceUrl { get; set; }
+	}
+
+	public class ViewHostDay
+	{
+		public DateTime Day { get; set; }
+		public Dictionary<string, long> Counters { get; set; } = new();
+		public Dictionary<string, long> Latency { get; set; } = new();
+		public Dictionary<string, long> Bytes { get; set; } = new();
+		public Dictionary<string, long> Reads { get; set; } = new();
+		public int Accounts { get; set; }
+		public bool Live { get; set; }//today's or a day not rolled up yet, folded from its events
+	}
+
+	// one ledger entry: what was received, delivered or fetched, and how it ended; never who
+	public class ViewInteractionEvent
+	{
+		public DateTime At { get; set; }
+		public string Host { get; set; }
+		public string Channel { get; set; }
+		public string Activity { get; set; }
+		public string Object { get; set; }
+		public string Purpose { get; set; }
+		public string Trigger { get; set; }
+		public string Outcome { get; set; }
+		public string Reason { get; set; }
+		public int? Status { get; set; }
+		public int? LatencyMs { get; set; }
+		public int? WaitMs { get; set; }
+		public long? Bytes { get; set; }
+		public int? Attempt { get; set; }
+		public string Audience { get; set; }
+		public string LocalKind { get; set; }
+		public string Inbox { get; set; }
+		public string Signature { get; set; }
+		public List<string> Features { get; set; } = [];
+		public long? AgeSeconds { get; set; }
+	}
+
+	// /clientapi/admin/statistics/server: the server's own day, its client API and the documents it served
+	public class ViewServerDay
+	{
+		public DateTime Day { get; set; }
+		public Dictionary<string, long> Client { get; set; } = new();
+		public Dictionary<string, long> ClientLatency { get; set; } = new();
+		public Dictionary<string, long> Served { get; set; } = new();
+		public long LedgerWritten { get; set; }
+		public long LedgerDropped { get; set; }
+		public long LedgerFailed { get; set; }
+		public int Accounts { get; set; }
+		public int Hosts { get; set; }
+	}
 }

PrivaPub/Api/Mastodon/Controllers/AccountsController.cs

@@ -181,6 +181,17 @@ namespace PrivaPub.Api.Mastodon.Controllers
 				? await search.Followed(MyId, Params.Get("q"), Limit(), token)
 				: await search.Find(Params.Get("q"), Params.Bool("resolve") == true && MyId != default, Limit(), token));
 
+		// Mastodon 4.3: several accounts at once (at most 40), those that exist, in no promised order
+		[HttpGet("/api/v1/accounts"), Scope("read:accounts", requiresUser: false), Microsoft.AspNetCore.Authorization.AllowAnonymous]
+		public async Task<IActionResult> Many(CancellationToken token)
+		{
+			var accounts = new List<object>();
+			foreach (var id in Params.List("id").Distinct().Take(40))
+				if (await _mapper.Account(id, token) is { } account)
+					accounts.Add(account);
+			return Json(accounts);
+		}
+
 		[HttpGet("/api/v1/accounts/{id}"), Scope("read:accounts", requiresUser: false), Microsoft.AspNetCore.Authorization.AllowAnonymous]
 		public async Task<IActionResult> Get(string id, CancellationToken token)
 		{

PrivaPub/Api/Mastodon/Controllers/MediaController.cs

@@ -64,6 +64,20 @@ namespace PrivaPub.Api.Mastodon.Controllers
 			};
 		}
 
+		// Mastodon 4.4: a persona's own upload, while nothing holds it (not posted, not scheduled, not a profile picture), goes to
+		// the trash as the janitor would take it
+		[HttpDelete("/api/v1/media/{id}"), Scope("write:media")]
+		public async Task<IActionResult> Delete(string id, CancellationToken token)
+		{
+			var attachment = await DB.Default.Find<MediaAttachment>().Match(m => m.ID == id && m.OwnerAvatarId == MyId && m.TrashedAt == null && m.ProfileOfAvatarId == null).ExecuteFirstAsync(token);
+			if (attachment == default)
+				return NotFoundError();
+			if (attachment.PostId != null || attachment.ScheduledStatusId != null)
+				return Error(StatusCodes.Status422UnprocessableEntity, "Media attachment is currently used by a status");
+			await _media.Trash(m => m.ID == attachment.ID && m.PostId == null && m.ScheduledStatusId == null, "deleted by its owner", token);
+			return Json(new { });
+		}
+
 		// as on Mastodon, only media not posted yet: a posted one's description and focus change by editing its post (media_attributes)
 		[HttpPut("/api/v1/media/{id}"), Scope("write:media")]
 		public async Task<IActionResult> Update(string id, CancellationToken token)

PrivaPub/Api/Mastodon/Controllers/SearchController.cs

@@ -77,7 +77,7 @@ namespace PrivaPub.Api.Mastodon.Controllers
 			if (type is null or "statuses" && MyId != default && !q.StartsWith('#') && !Handle().IsMatch(q))
 				results.Statuses = await Words(q, Math.Max(0, offset), Limit(), token);
 			if (type is null or "hashtags" && TagsController.Normalise(q) is var tag && TagsController.IsHashtag(tag))
-				results.Hashtags.Add(new { name = tag, url = $"{_localActors.BaseAddress}/tags/{Uri.EscapeDataString(tag)}", history = Array.Empty<object>() });
+				results.Hashtags.Add(new { name = tag, url = $"{_localActors.BaseAddress}/tags/{Uri.EscapeDataString(tag)}", history = await TagsController.History(_dbEntities, tag, token) });
 			return Json(results);
 		}
 	}

PrivaPub/Domain/Statistics/StatisticsQueries.cs

@@ -128,7 +128,7 @@ namespace PrivaPub.Domain.Statistics
 			return new ViewHostsPage { Total = list.Count, Page = Math.Max(page, 1), Hosts = list.Skip((Math.Max(page, 1) - 1) * limit).Take(limit).ToList(), Attribution = Attribution };
 		}
 
-		public async Task<object> Host(string host, int days, CancellationToken token)
+		public async Task<ViewHostDetail> Host(string host, int days, CancellationToken token)
 		{
 			host = Interactions.Host(host);
 			var instance = await DB.Default.Find<RemoteInstance>().Match(i => i.Host == host).ExecuteFirstAsync(token);
@@ -136,20 +136,41 @@ namespace PrivaPub.Domain.Statistics
 			var events = await DB.Default.Find<InteractionEvent>().Match(e => e.Host == host).Sort(e => e.At, Order.Descending).Limit(100).ExecuteAsync(token);
 			if (instance == default && hostDays.Count == 0 && events.Count == 0)
 				return default;
-			return new
+			return new ViewHostDetail
 			{
 				Host = host,
-				Instance = instance,
-				Days = hostDays.Select(d => new { d.Day, d.Counters, d.Latency, d.Bytes, d.Reads, d.Accounts, d.Live }),
-				Events = events,
-				Attribution
+				Instance = instance == default ? default : new ViewHostInstance
+				{
+					Software = instance.Software, SoftwareVersion = instance.SoftwareVersion, NodeName = instance.NodeName, Title = instance.Title,
+					NodeDescription = instance.NodeDescription, OpenRegistrations = instance.OpenRegistrations, RegistrationMode = instance.RegistrationMode,
+					UsersTotal = instance.UsersTotal, UsersActiveMonth = instance.UsersActiveMonth, LocalPosts = instance.LocalPosts,
+					Languages = instance.Languages ?? [], Seen = instance.Seen, FirstSeenAt = instance.FirstSeenAt, LastSeenAt = instance.LastSeenAt,
+					DescribedAt = instance.DescribedAt, DescriptionError = instance.DescriptionError, LastSuccessAt = instance.LastSuccessAt,
+					LastFailureAt = instance.LastFailureAt, LastError = instance.LastError, ConsecutiveFailures = instance.ConsecutiveFailures,
+					UnavailableUntil = instance.UnavailableUntil, Country = instance.Geo?.Country, City = instance.Geo?.City, Asn = instance.Geo?.Asn,
+					AsnOrg = instance.Geo?.AsnOrg, Cdn = instance.Geo?.Cdn, InstanceApi = instance.InstanceApi, SourceUrl = instance.SourceUrl
+				},
+				Days = hostDays.Select(d => new ViewHostDay
+				{
+					Day = d.Day, Counters = new(d.Counters), Latency = new(d.Latency), Bytes = new(d.Bytes), Reads = new(d.Reads ?? new Dictionary<string, long>()),
+					Accounts = d.Accounts, Live = d.Live
+				}).ToList(),
+				Events = events.Select(View).ToList(),
+				Attribution = Attribution
 			};
 		}
 
-		public async Task<List<InteractionEvent>> Events(string host, string channel, string outcome, string reason, DateTime? before, int limit, CancellationToken token)
+		static ViewInteractionEvent View(InteractionEvent e) => new()
+		{
+			At = e.At, Host = e.Host, Channel = e.Channel, Activity = e.Activity, Object = e.Object, Purpose = e.Purpose, Trigger = e.Trigger,
+			Outcome = e.Outcome, Reason = e.Reason, Status = e.Status, LatencyMs = e.LatencyMs, WaitMs = e.WaitMs, Bytes = e.Bytes, Attempt = e.Attempt,
+			Audience = e.Audience, LocalKind = e.LocalKind, Inbox = e.Inbox, Signature = e.Signature, Features = e.Features ?? [], AgeSeconds = e.AgeSeconds
+		};
+
+		public async Task<List<ViewInteractionEvent>> Events(string host, string channel, string outcome, string reason, DateTime? before, int limit, CancellationToken token)
 		{
 			var hostName = host == default ? default : Interactions.Host(host);
-			return await DB.Default.Find<InteractionEvent>()
+			return (await DB.Default.Find<InteractionEvent>()
 				.Match(e => hostName == null || e.Host == hostName)
 				.Match(e => channel == null || e.Channel == channel)
 				.Match(e => outcome == null || e.Outcome == outcome)
@@ -157,7 +178,7 @@ namespace PrivaPub.Domain.Statistics
 				.Match(e => before == null || e.At < before)
 				.Sort(e => e.At, Order.Descending)
 				.Limit(Math.Clamp(limit, 1, 200))
-				.ExecuteAsync(token);
+				.ExecuteAsync(token)).Select(View).ToList();
 		}
 
 		public async Task<ViewCrawler> Crawler(bool enabled, int revisitDays, CancellationToken token)
@@ -183,10 +204,15 @@ namespace PrivaPub.Domain.Statistics
 			};
 		}
 
-		public async Task<List<ServerDay>> Server(int days, CancellationToken token)
+		public async Task<List<ViewServerDay>> Server(int days, CancellationToken token)
 		{
 			var since = DateTime.UtcNow.Date.AddDays(1 - Math.Clamp(days, 1, 3660));
-			return await DB.Default.Find<ServerDay>().Match(d => d.Day >= since).Sort(d => d.Day, Order.Ascending).ExecuteAsync(token);
+			return (await DB.Default.Find<ServerDay>().Match(d => d.Day >= since).Sort(d => d.Day, Order.Ascending).ExecuteAsync(token))
+				.Select(d => new ViewServerDay
+				{
+					Day = d.Day, Client = d.Client, ClientLatency = d.ClientLatency, Served = d.Served, LedgerWritten = d.LedgerWritten,
+					LedgerDropped = d.LedgerDropped, LedgerFailed = d.LedgerFailed, Accounts = d.Accounts, Hosts = d.Hosts
+				}).ToList();
 		}
 
 		public static Dictionary<string, long> Outcomes(IReadOnlyDictionary<string, long> counters, string channel)